Process of producing glossy threads from viscose.



' ever,

V MARCO IBIROLI, 0F IPAVIA. ITALY.

rnocnss or rn'onucme 1,226,1'78. 1V0 Drawing.

To all whom it may concern:

Be it lmown' that I, MARCO ject of the King Piazza Carmine, avia, Italy, have invented certain new and useful Improvements in Processes of. Producing Glossy Threads from Viscose, of which the following is a 4 specification.

This invention relates to'a process for producing glossy threads from viscose.

Processes are already known for directly obtaining cellulose threads, which are, hownot xanthogenate threads, by means of a bath of bisulfate and sulfuric acid, such a process being disclosed in Muller, No. 836,452, of November 20, 1906.

Accordingto the present invention, sodium bisulfate alone is used. To produce such a thread, it is necessary to ado t such a degreeofconcentration of the solutlon, such a temperature and such a mechanical arrangement that, after the issue of the viscose from the drawing plate, a xanthogenate thread is formed in the coagulation bath. This xanthogenate thread, in a further phase, is

transformed'into a cellulose thread by being passed into a fixation bath consisting of a suitable diluted acid. The de cc of concentration of the acid salt solut on must be so adjusted that only composition is obtained. It hasbeen found that a 27% solution of sodium bisulfate, without the addition of sulfuric acid and under, determined temperature conditions, avera e 50 0., for instance, may be suc cessf 1y used. a

'llo the combinations which are not capable Specification of Letters Patent.

BIROLI, a sub-; selves,

of Italy, residing at 3 a moderate degree of de- Y GLOSSY runners FIR-0M v'xscosn.

Patented Ma 15,1917.

Application filed November 18, 1916. Serial No. 132,108. i

of decomposing the xanthogeil'ate for thembut require further treatment of the thread by a fixation liquid, belongthe solutions of salts and organicacids.

It'- hasbeen found that'the following solutions give the best results saturated sodium chlorid so- 'lution containmg. 10% of industrial acetic First. Nearly acid. J

taining 10% of acetic or formic acid.'

The artificial silk threads manufactured according to the present 7 process possess high technical, value, as they are superior to all other viscose threadsQfor their bright gloss, softness of touch and strength.

. What I claim is:- i

1. The process of producing glossy threads from viscose which consists in passing the viscose threads into a bath of sodium bisule fate with the formation of xanthogenate,

and then passing-the resulting threads into Second. Magnesium sulfate solution cona solution containing an organic acid radical. 6

2. The processof producing glossy threads from viscose which consists in passing the threads into a bath of sodium bisulfate with the formation of xanthogenate, and then assing the resulting threads into a bath of suitable salts and organic acids to cause the decomposition or fixation of the xantho- I genate threads: 

